Chapter 5: Life Processes — Online MCQ Test
SCIENCE · Grade 10 · CBSE(NCERT)
Practice Chapter 5: Life Processes with a free chapter-wise online MCQ test.
This chapter covers: Nutrition Autotrophic Heterotrophic Photosynthesis Respiration Transportation Excretion Digestive system Circulatory system Xylem Phloem Nephron.
AI-generated questions from basic to board-exam level, with instant results and explanations.
Chapter 5: Life Processes — Important Questions & Answers
Which mode of nutrition is used by green plants to prepare their own food?
- A. Autotrophic nutrition
- B. Heterotrophic nutrition
- C. Saprotrophic nutrition
- D. Parasitic nutrition
Answer: A. Autotrophic nutrition
Green plants prepare their own food using carbon dioxide, water and sunlight. This is called autotrophic nutrition.
Green plants prepare their own food using carbon dioxide, water and sunlight. This is called autotrophic nutrition.
Amoeba obtains food by surrounding it with its cell membrane. This process is called:
- A. Diffusion
- B. Endocytosis
- C. Transpiration
- D. Excretion
Answer: B. Endocytosis
Amoeba takes in food by forming temporary projections called pseudopodia around it. This method of intake is called endocytosis.
Amoeba takes in food by forming temporary projections called pseudopodia around it. This method of intake is called endocytosis.
Which of the following are the main raw materials required for photosynthesis?
- A. Oxygen and glucose
- B. Carbon dioxide and water
- C. Nitrogen and oxygen
- D. Glucose and starch
Answer: B. Carbon dioxide and water
Plants use carbon dioxide from air and water from soil to make glucose during photosynthesis. Sunlight and chlorophyll are also necessary for the process.
Plants use carbon dioxide from air and water from soil to make glucose during photosynthesis. Sunlight and chlorophyll are also necessary for the process.
The tiny pores present on the surface of leaves for gaseous exchange are called:
- A. Villi
- B. Nephrons
- C. Stomata
- D. Alveoli
Answer: C. Stomata
Stomata are small pores on leaves that allow exchange of gases like carbon dioxide and oxygen. They are regulated by guard cells.
Stomata are small pores on leaves that allow exchange of gases like carbon dioxide and oxygen. They are regulated by guard cells.
A student covers part of a leaf with black paper and keeps the plant in sunlight. After the iodine test, only the uncovered part turns blue-black. What does this show?
- A. Oxygen is needed for photosynthesis
- B. Light is necessary for photosynthesis
- C. Water is not needed for photosynthesis
- D. Chlorophyll is not involved in photosynthesis
Answer: B. Light is necessary for photosynthesis
The uncovered part receives sunlight and forms starch, which turns blue-black with iodine. The covered part does not receive light and therefore does not make starch.
The uncovered part receives sunlight and forms starch, which turns blue-black with iodine. The covered part does not receive light and therefore does not make starch.
During heavy exercise, muscle cells may produce lactic acid because:
- A. Aerobic respiration completely stops in lungs
- B. Oxygen supply to muscles becomes insufficient
- C. Glucose cannot enter muscle cells
- D. Carbon dioxide is converted into lactic acid
Answer: B. Oxygen supply to muscles becomes insufficient
When oxygen supply is insufficient, muscle cells carry out anaerobic respiration. This produces lactic acid, which can cause cramps.
When oxygen supply is insufficient, muscle cells carry out anaerobic respiration. This produces lactic acid, which can cause cramps.
Why is aerobic respiration more efficient than anaerobic respiration?
- A. It occurs only in plants
- B. It releases much more energy from each glucose molecule
- C. It does not require glucose
- D. It produces alcohol in human muscles
Answer: B. It releases much more energy from each glucose molecule
Aerobic respiration completely breaks down glucose into carbon dioxide and water, releasing more energy. Anaerobic respiration gives only partial breakdown of glucose.
Aerobic respiration completely breaks down glucose into carbon dioxide and water, releasing more energy. Anaerobic respiration gives only partial breakdown of glucose.
Which sequence correctly shows the path of deoxygenated blood in the human heart and lungs?
- A. Right atrium → Right ventricle → Pulmonary artery → Lungs
- B. Left atrium → Left ventricle → Pulmonary artery → Lungs
- C. Right ventricle → Right atrium → Aorta → Lungs
- D. Left ventricle → Left atrium → Pulmonary vein → Lungs
Answer: A. Right atrium → Right ventricle → Pulmonary artery → Lungs
Deoxygenated blood enters the right atrium and then moves to the right ventricle. From there it is pumped to the lungs through the pulmonary artery.
Deoxygenated blood enters the right atrium and then moves to the right ventricle. From there it is pumped to the lungs through the pulmonary artery.
A plant cell has enough carbon dioxide and water but lacks chlorophyll. What will be the direct effect on photosynthesis?
- A. Photosynthesis will occur faster
- B. Photosynthesis will not occur effectively because light cannot be trapped
- C. Only oxygen will be produced without glucose
- D. Glucose will be made without sunlight
Answer: B. Photosynthesis will not occur effectively because light cannot be trapped
Chlorophyll traps light energy needed for photosynthesis. Without chlorophyll, the plant cannot effectively convert carbon dioxide and water into glucose.
Chlorophyll traps light energy needed for photosynthesis. Without chlorophyll, the plant cannot effectively convert carbon dioxide and water into glucose.
Which of the following pairs is correctly matched?
- A. Pepsin - digests proteins in stomach
- B. Bile - digests starch in mouth
- C. Salivary amylase - digests fats in small intestine
- D. Trypsin - emulsifies fats in stomach
Answer: A. Pepsin - digests proteins in stomach
Pepsin is a stomach enzyme that digests proteins in an acidic medium. Bile emulsifies fats, while salivary amylase acts on starch.
Pepsin is a stomach enzyme that digests proteins in an acidic medium. Bile emulsifies fats, while salivary amylase acts on starch.